1405645 has 16 divisors (see below), whose sum is σ = 1866240. Its totient is φ = 1010944.

The previous prime is 1405643. The next prime is 1405669. The reversal of 1405645 is 5465041.

It is a cyclic number.

It is not a de Polignac number, because 1405645 - 2¹ = 1405643 is a prime.

It is a super-3 number, since 3×1405645³ = 8331979851566133375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1596 + ... + 2314.

It is an arithmetic number, because the mean of its divisors is an integer number (116640).

2^1405645 is an apocalyptic number.

It is an amenable number.

1405645 is a deficient number, since it is larger than the sum of its proper divisors (460595).

1405645 is a wasteful number, since it uses less digits than its factorization.

1405645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1405645 is about 1185.5990047229. The cubic root of 1405645 is about 112.0190496934.

The spelling of 1405645 in words is "one million, four hundred five thousand, six hundred forty-five".